/*
 * ==========================================================================================
 * =                   JAHIA'S DUAL LICENSING - IMPORTANT INFORMATION                       =
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 *
 *                                 http://www.jahia.com
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 *     Copyright (C) 2002-2025 Jahia Solutions Group SA. All rights reserved.
 *
 *     THIS FILE IS AVAILABLE UNDER TWO DIFFERENT LICENSES:
 *     1/Apache2 OR 2/JSEL
 *
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 *     Copyright (C) 2002-2025 Jahia Solutions Group SA. All rights reserved.
 *
 *     Licensed under the Apache License, Version 2.0 (the "License");
 *     you may not use this file except in compliance with the License.
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *     distributed under the License is distributed on an "AS IS" BASIS,
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 *     2/ JSEL - Commercial and Supported Versions of the program
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package org.jahia.taglibs.search.facets;

import java.util.HashSet;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

/**
 * Custom search facet functions, which are exposed into the template scope.
 *
 * @author Sergiy Shyrkov
 *
 * @since 7.2.3.1
 */
public class Functions {

    /**
     * Retrieves the data of the requested facet to be used in a JSP view when rendering facet search results.
     *
     * @param facetId the ID of a facet to retrieve information for
     * @param request current HTTP request instance
     * @return the data of the requested facet to be used in a JSP view when rendering facet search results
     */
    public static FacetData getFacetData(String facetId, HttpServletRequest request) {
        FacetData data = new FacetData();
        data.setParameterNameRegex("src_facets\\(" + facetId + "\\).*");
        data.setValueParameterName("src_facets(" + facetId + ").value.values");

        populateActiveValues(data, request);

        return data;
    }

    private static void populateActiveValues(FacetData data, HttpServletRequest request) {
        String[] values = request.getParameterValues(data.getValueParameterName());
        if (values != null && values.length > 0) {
            Set<String> activeValues = new HashSet<>();
            for (String val : values) {
                activeValues.add(val);
            }
            data.setActiveValues(activeValues);
        }
    }
}
